Byz, some of the cases I have seen with women who have Aspbergers or Autism , the language skills and the expressiveness mask the disorder and the level of severity that the women might actually have. Boys tend to be less verbal, and perhaps it is therefore they show the more extreme behavioural problems at a lesser degree of syndrom severity. For a girl to show the traditional autistic/aspberer traits to the same extent as a boy, she really has be be affected.
Estrogen is a powerful spurr to development in linguistic areas, and it is probably this which makes it hard to catch the girls with AS. There is more of a chance that a girl with the disorder would,, because of this , not show the same linguistic difficulties that a boy, with less estrogen in his developmental history, would have.